Percona Server for MongoDB 3.2.7-1.1 - WiredTiger vs InMemory sysbench oltp performance

Setup

• WiredTiger: psmdb 3.2.7-1.1
• InMemory: built from source, v3.2 percona-server-mongodb branch
• sysbench with mongodb support, oltp and oltp_ro scripts
• inMemorySizeGB / wiredTigerCacheSizeGB set to 32GB
• Data set: 8 collections, 6M documents per collection (12GB compressed)

Benchmark procedure

• For WiredTiger: restore the datadir from binary backup before each experiment
• For InMemory: restore the datadir with mongorestore (taken with mongodump from the same data set used to create the binary backup for WiredTiger) before each experiment
• Sysbench runs of 60 seconds